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annotate f-demime/attach_out.c @ 0:7e0d08176f32

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f-demime starting code
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 06 May 2023 06:14:03 +0000
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7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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Mychaela Falconia <falcon@freecalypso.org>
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2 * This module contains code for creating (writing) secondary output files
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Mychaela Falconia <falcon@freecalypso.org>
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3 * intended for storing attached base64 blobs.
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Mychaela Falconia <falcon@freecalypso.org>
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4 */
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5
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Mychaela Falconia <falcon@freecalypso.org>
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6 #include <sys/file.h>
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Mychaela Falconia <falcon@freecalypso.org>
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7 #include <stdio.h>
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Mychaela Falconia <falcon@freecalypso.org>
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8 #include <stdlib.h>
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Mychaela Falconia <falcon@freecalypso.org>
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9 #include <string.h>
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Mychaela Falconia <falcon@freecalypso.org>
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10 #include <strings.h>
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Mychaela Falconia <falcon@freecalypso.org>
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11 #include <unistd.h>
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Mychaela Falconia <falcon@freecalypso.org>
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12 #include "defs.h"
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13
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Mychaela Falconia <falcon@freecalypso.org>
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14 extern char *att_filename_buf, *att_filename_tail;
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Mychaela Falconia <falcon@freecalypso.org>
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15 extern void (*dec_outf)();
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Mychaela Falconia <falcon@freecalypso.org>
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16
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17 static unsigned att_count;
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Mychaela Falconia <falcon@freecalypso.org>
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18 static FILE *att_outf;
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Mychaela Falconia <falcon@freecalypso.org>
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19 static int giveup_flag;
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Mychaela Falconia <falcon@freecalypso.org>
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20
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21 static void
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Mychaela Falconia <falcon@freecalypso.org>
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22 output_func(ch)
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Mychaela Falconia <falcon@freecalypso.org>
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23 {
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Mychaela Falconia <falcon@freecalypso.org>
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24 putc(ch, att_outf);
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25 }
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26
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27 init_attach_out()
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28 {
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29 int fd;
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30
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31 if (giveup_flag)
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Mychaela Falconia <falcon@freecalypso.org>
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32 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
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33 for (;;) {
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Mychaela Falconia <falcon@freecalypso.org>
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34 if (att_count >= 10000) {
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Mychaela Falconia <falcon@freecalypso.org>
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35 giveup_flag = 1;
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Mychaela Falconia <falcon@freecalypso.org>
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36 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
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37 }
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Mychaela Falconia <falcon@freecalypso.org>
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38 sprintf(att_filename_tail, "%04u", att_count++);
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Mychaela Falconia <falcon@freecalypso.org>
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39 fd = open(att_filename_buf, O_WRONLY|O_CREAT|O_EXCL, 0644);
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Mychaela Falconia <falcon@freecalypso.org>
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40 if (fd >= 0)
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Mychaela Falconia <falcon@freecalypso.org>
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41 break;
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42 }
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43 att_outf = fdopen(fd, "w");
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44 if (!att_outf) {
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Mychaela Falconia <falcon@freecalypso.org>
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45 perror("fdopen");
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Mychaela Falconia <falcon@freecalypso.org>
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46 close(fd);
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Mychaela Falconia <falcon@freecalypso.org>
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47 return(-1);
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48 }
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Mychaela Falconia <falcon@freecalypso.org>
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49 dec_outf = output_func;
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Mychaela Falconia <falcon@freecalypso.org>
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50 return(0);
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Mychaela Falconia <falcon@freecalypso.org>
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51 }
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Mychaela Falconia <falcon@freecalypso.org>
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52
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53 void
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Mychaela Falconia <falcon@freecalypso.org>
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54 attach_out_finish()
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Mychaela Falconia <falcon@freecalypso.org>
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55 {
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Mychaela Falconia <falcon@freecalypso.org>
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56 fclose(att_outf);
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57 }